X-ray synthesis of nickel-gold composite nanoparticles

Abstract

We developed a novel approach to prepare Ni-Au composite nanoparticles using synchrotron radiation X-rays. Ni-Au particles dispersed in aqueous solutions were synthesized with two different irradiation strategies. The first is by exposing to X-rays a mixed electroless solution of Ni and An at two different temperatures, trying to nucleate Ni nanoparticles homogeneously at room temperature and to deposit An subsequently on them at the high temperature of 70 degrees C. The second strategy is to change the pH value of the mixed solution, directly leading to the formation of Ni-Au nanoparticles. In both cases, the Ni-Au composite nanoparticles were successfully formed, as confirmed by the observed ferromagnetic behavior and by the evolution of the Au surface plasmon resonance band. (c) 2006 Elsevier B.V. All rights reserved.